Staging-jack



(No Model.)

M. w. EEEvEs. STAGING JACK.

No. 563,309 Patented Jilly 7,1896;

ports when being adjusted.

UNITED STATES PATENT OFFICE.

MADISON \V. REEVES, OF SAYRE, PENNSYLVANIA.

, STAGING-JAG K.

SPECIFICATION formingpart of Letters Patent No. 563,309, dated July '7,1896.

Application filed November 4, 1895. Serial No. 567,882. (No model.)

To all whmn it may concern;

Be it known that I, MADISON W. REEVES, of Sayre, in the county ofBradford and State of Pennsylvania, have invented certain new and usefulImprovements in Staging-Jacks; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and useit, reference being had to the accompanying drawings, which form part ofthis specification.

This invention pertains to staging-jacks; and the object of the same isto provide an improved jack or scaifold which may be adj ustedvertically at both ends, so as to stand horizontally or adjusted at oneend only, for the purpose of sustaining a staging or scaffolding at anincline when desired.

The invention consists in the novel features of construction hereinafterfully described and claimed, and illustrated by the accompanyingdrawings, in which Figure 1 is a perspective View of the improved jack.Fig. 2 is a side elevation of the same, showing the position of one ofthe sup- Fig. 3 is a side elevation showing the position of the partswhen the jack is raised only slightly above the floor or ground. Fig. 4is a similar view showing the jack when completely folded.

A designates the ridge pole or beam of the jack, which is formed on itstop edge with notches or depressions B. These notches are arranged intwo series, one upon each side of the vertical center of the beam and atcorresponding distances from said point, so. that when the supports forthe beam hereinafter described are placed at corresponding notches thesaid beam will be supported on a plane parallel with the plane uponwhich the said supports rest. The supports 0 each consists of a centerbar D, carrying the laterally-diverging feet or legs E, which areconnected near their lower extremities with cross-bar F, and to thelast-named bar the bar D is also secured at its lower end. The bar Dabout midway its ends is pivotally secured between the lower ends of thearms F, depending from the ends of the beam A, to which they arepivotally secured.

The forward or upper end of each bar D is rounded, as indicated at D,and carries a U- shaped bail G, through which beam A extends, the saidbail being adapted to engage one of notches B and firmly hold thereinwhen bar D is moved slightly forward or toward the center of beam A, asclearly shown in the drawings.

The supports 0, swinging on arms F, may be adjusted readily eithertoward or away from the vertical center of the beam A,as may be desired,for either lowering or raising the jack, and secured at the desiredpoint by engagement of the bail with the notches, as above stated. Withthe bail crossing the beam at right angles there is suflicient room topermit of the bail passing over the spaces between the notches, so as tosecure the adjustment desired. I

For securing a very slight vertical adj ustment of the jack, so as toraise it only a short distance above the plane of the lower extremi tiesof the supports 0, the outer edges of arms F are notched, at 0, wherethey are engaged by the pivoted stops P on the lower portions of bars D.These stops are formed of the two parallel arms carrying between theirouter ends the slightly-projected blocks P, which extend between arms Fand serve to guide the stops to proper place.

A jack of the construction here shown and described may be readilyadjusted to the height desired, either to stand horizontally or at anincline, and may also be compactly folded when not in use.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. The combination of abeam notched upon its upper edge, a support foreach end of the beam, a swinging arm or link connection between eachsupport and the respective ends oft-he beam, and a bail carried by theinner upper end of each support and surrounding the beam so as to engagethe notches formed therein, substantially as shown and described.

2. The combination of a beam, a support for each end of the beam, aswinging arm or link connection between the said supports and therespective ends of the beam, and a means for securing the inner upperends of the supports to the beam, substantially as shown and described.

3. The combination of a beam formed with two series of notches arrangedon opposite sides of and at equal distances from the vertical center ofthe beam, supports having pivotal connections with the extremities ofthe beam, and bails carried by the inner ends of the supports forengaging the notches in the beam, substantially as shown and described;

4:. The combination of the beam having the notches formed in its upperedge, supports 0, pivotal arms F connecting the supports with theextremities of the beam, said arms F being notched at O, and the pivotedstops P carried by supports 0 for engaging said notches, for the purposesubstantially as herein shown and described.

In testimony whereof I aflix my signature in presence of two witnesses.

MADISON XV. REEVES. Vitnesses:

M. P. 1\IURRAY, M. H. SAWTELLE.

